HIGH

CVE-2026-54059

CVSS v3

7.5

HIGH

EPSS Score

0.4 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

pillowPyPIall versions · fixed in 12.3.0
pillowBitnamiall versions · fixed in 12.3.0
python3-pillowAlmaLinux:8all versions · fixed in 5.1.1-22.el8_10and 3 other packages

Vendor advisories

CVE-2026-54059 Red Hat Product Security136 products fixed · 1 known affected
python-pillow: Pillow: Denial of Service via crafted PCF font data
satellite:el8/python-pillow.src as a component of Red Hat Satellite 6
RHSA-2026:52551 Red Hat Product Security12 products fixed
Red Hat Security Advisory: python-pillow security update
RHSA-2026:50336 Red Hat Product Security13 products fixed
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update
RHSA-2026:50319 Red Hat Product Security10 products fixed
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update
RHSA-2026:50263 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Satellite 6.18.8 Async Update
RHSA-2026:50223 Red Hat Product Security8 products fixed
Red Hat Security Advisory: Satellite 6.16.12 Async Update

5 more advisories

Full record on NVD

Description

Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-07-06
Last Modified: 2026-07-07
GitHub Advisory: GHSA-8v84-f9pq-wr9x

Frequently asked questions

What is CVE-2026-54059?

Is CVE-2026-54059 actively exploited?

Active exploitation of CVE-2026-54059 has not been confirmed. Its EPSS score was 0.4% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-54059?

CVE-2026-54059 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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